Speedometer testing machine



19, 1952 v c. B. ROSE 2,607,212

SPEEDOMETER TESTING MACHINE Filed Feb. 4, 1948 3 Sheets-Sheet 1 Fig. l.

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Charles 8. Rose INVENTOR.

c. B. ROSE I SPEEDOMETERV TESTING MACHINE Aug. 19, 1952 3 Sheets-Sheet 2Charles 8. Rose IN V EN TOR.

Filed Feb. 4, 1948 Aug. 19, 1952 c. B. ROSE SPEEDOMETER TESTING MACHINE5 Sheets-Sheet 3 Filed Feb. 4, 1948 m& m

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- Chafles 5. Rose INVENTOR.

m M A Patented Aug. 19, 1952 UNITED STATES PATENT OFFICE Y SPEEDOMETERCharles Rose, Atlanta; Gazi Lueyv; Rose executrix or. said- CharlesRose, deceased Application February 4, 1948, Serial 6,13 7

This invention appertains tov novel and useful improvements in a testdevice for use in association with automotive vehicle mileage andspeedindicators. I

An object of this invention is to test acou'lfatel'y automobile andtruck sp'eedometers and tachometers and their driving connections. todetermine their accuracy under the conditions which they normallyoperate.

Another object of thisinvention is to electrically actuate a masterspeed indicator by means of current generated by the movement, of thedriver wheelsof avehicle. I

Another object or this invention is to test-the mileage indicator in avehicle through electrical means, the current being. intermittentlysupplied to an electrically operative master mileage indicator throughthe medium of a switch which is actuated by means of the rotation of thedriver Wheels of a vehicle;

Another object of this invention is to supplya simplified deviceutilizing numerous conventional elements for aocuratelyandnormallyjtesting certain indicators of conventional vehicles. l

A further object of this invention lslto prevent rotation of a drivenroller in a single direction, whereby the vehicle may normally andeasily be moved from the roller under its ownpower Ancillary objects andfeatures of novelty Willbecome apparent to those skilled in the art, infollowing the description of the preferred term of the invention,illustrated in the accompanying" drawings, wherein: i

Figure 1 is an elevational' end viewer the preferred form of theinvention showing thesame in use;

Figure 2 is an enlarged fragmentary plan View of details ofconstruction;

Figure 3 is a sectional View of Ia gear reduction mechanism and worm andgear drive utili "d association with the invention ;1

Figure 4 is schematic Wiring diagram mustr'ating operative elements insection to clearly disclose details of construction; j

Figure 5" is a sectional view'tal ie'ri substantially 1 Glaim. (or-73 2Figure 7 is a perspective view illustrating par-- ti'ciilarly thearrangement of rollers and the locking'jineaiisjlfor impeding the travelof selected rollers'i'n one direction? Figii-res is an el'e"tional'vi'e'w of the apparatus show ng the samein association with asuitable concept, certain structure required'is illustrated herewith andwill be described at this time.

A suitable stand or support which might be concrete as disclosed inFigure 7 and indicated at lll,.i's provided with recesses or wells [2. Asuitable cover plate l6 may be supplied in association with'the wellsand bearings l8 and 20 respectively secured thereto. Suitable idlerrollers 22 may be within the wells. A pair of rollers 26 and 28' reonthe line 5'-=5 of Figure 4 and. direction ofth'e arrows; k r

Figure 6 is a sectional view taken substantially onthe' line 66 ofFigure 4. and". the. direction;

of thea'rrows;

spectively are ecured to a common shaft 30.

which extends across the well IL. This of course drivinglyconnects theopposed rollers 26 and 2B.

Inoperation of this portion of the invention, the rear wheels of aconventional vehicle are placed on the rollers 22. 25 and 28 and theengine of the vehicle is rendered operative.

Of course, the rear wheels of the'vehicle are also operated bythe enginethereby rotating the said rollers. U

The specific construction of the rollers may be either smooth andcomposed of a resilient material, or' it desired, small grooves may besupplied therein for the purpose of supplying additional" traction.

Whe

that is necessary is to-operatethevehicle in a backward direction. Inthis operation, means for preventing rotation of the connected rollers'26 I and. 28'. is rendered operative. The preferable means may be seenas an arm 32 pivotally positioned a rod 34'; The said rod is resilientlybiased by means of a spring 36 which seats in I T is desired to removethe vehicle from I the support if], as when a test is completed, all

the bore of the arm 32 and engages the rod 34. In order to preventundesired movement of the rod 34 relative to the arm 32, a small pin maybe secured to the rod and extend through a suitable slot 38 formed inthe arm 32. This construction of course, limits the travel of the rod 34relative to the arm 32. A look roller 40 is supplied adjacent oneterminal portion of the rod 34 and is engageable with the roller 20. Ofcourse, when the roller 28 is actuated in a reverse direction (reverserelative to the movement of the vehicle) the lock roller 40 will beclamped beneath the peripheral surface of the roller '28 and on the seator bottom portion of the well I2.- r

A major electrical circuit is supplied in associa-. tion with andforming a part of the invention, which major circuit includes two minorcircuits. Referring to Figure 4 the first minor circuit may be seen asincluding current conversion means and illustrated as the copper oxiderectifier 42.

with the intermittent pulsations caused by the switch 50.

A resilient contact arm 94 is attached to the housing 90 by a suitablemeans such as the rivet 96 and extends over a core of theelectromagnetic means. The resilient arm 94 is constantly biased upwarddue to its inherent characteristics and the electromagnet checks thesame upon energization as the arm 94 is actuated in this manner, afinger 98 which is attached thereto engages the progressive teeth on acog wheel I00. The said cog wheel is supported to a suitable bracket I02which is also seated on the base of the housing 90. Upon rotation of thecog wheel I00, the shaft I04; is rotated, as is the worm I06 which isrigidly attached thereto. This worm I06 is enmeshed with a pinion I08,the pinion being tioned' is attached also to this shaft H0 and a Asuitable alternating current outlet may be tapped by means of the plug44 for supplying the rectifier with alternating current. The'output isof course, direct current which extends or travels.

therefrom through the medium of the conducintermittently supplied to theelectromagnet 54 through the "medium of conductors 52 and;

Drivingly'connected with the roller 26 is the aforementioned shaft andthe said shaft may be additionally supported by means of a conventionalbearing 58. A mechanism for transferring the torque of the shaft 30 invarious directions and at various speeds is supplied. As is seen inFigure 3 it may be supplied in a well 60 in the support I0. Thepreferable construction of the transmission means includes a gearcasingGZ having a gear journalled therein, which'gearis connected withthe shaft 30. A pinionfiifi is in mesh with the gear 64 and has ashaft68 rigidly secured thereto.

As is seen in Figures 3 and 4 the said shaft 68 extends to a gear box"I0 including gears having opposed shafts attached thereto. Theseopposed shafts are housed in suitable sleeves I2 and I4 respectively,which sleeves terminate in a suitable housing IBjand a generator I8.

The housing I6 contains a mileage transmitter whichlis composed ofawormge'ar 80 suitably journalled in the housing and a pinion 82lenmeshed therewith. A shaft 84 is operatively connected with the pinion82 and extends through the'housing I6 at one end thereof. A cam 86 maybe attached to the free end of the shaft 84 which extends through thehousing I6 and this cam. engages a plunger 88 for intermittentlyactuating this switch 50. 'By this construction it is now apparent thatupon rotation of the roller means 26 and 28, the switch will beintermittently actuated in order to supply pulsations of current to theelectromagnet 54 in accordance with the speed of the rollers. I

mechanism for movinga hand 92 in accordance suitable indicia bearingplate H2 is positioned thereunder. lntermittent pulsations from therectifier cause the hand 92 to be moved in stages inaccordance with therotation of the rollers 26 and 28 and consequently the rotation of thedriving wheels of a vehicle.

Referring now to the'second minor circuit, it is readily apparent thatthree leads I20, I22 and I24 respectively extend from the generator 18.These leads terminate in suitable terminals extending through a housingI26. The said housing I26 has a speed indicator or tachometer I28of'conventional character positioned therein. Of course, two of theleads I20 and I22 are positive while'the other lead I24 may be a groundconnection.

From the above described second minor circuit in the main circuit, itmay be readily appreciated that upon rotation of the rollers 26 and 28respectively as urged by the driving wheels of a vehicle, the actualspeed of the wheels may be indicated'on the master speed indicatorwithin the-housing I26 The'master mileage indicator and masterispeedindicator may be positioned in a suitable support or stand I30,illustrated in Figure 8." Of course; if it'is found desirable the legsof the stand I30 maybe omitted thus producing a stand' or support asindicated at I32 jFigurejjl.[This stand may be secured to a,

suitable wall or the'like wherein it might be viewedlfro'mithe"operators seat of the vehicle being tested sothat the'mileagefand speed indicators of thefvehicle might, be correlated withthe masterindicators.

The operation of the invention has been setforth accompanying thestructure description.

11; is'underj'sto'od of. course that variations may be made however,without-departing from they spirit of the invention. Accordingly,limitation is sought only in accordance with the scope of the followingclaim.

Having described the invention, what is support; a spring disposed', incontacting relationship with said arm, .afrodextensibly connected withsaid arm and" having said spring bearing 'thereagainstfconstantly urgingsaid rod outwardly of said arm, a stop connected to said arm and saidrod for limiting the extent of extensible' movement ofjsaid rod withrespect to, said armfa locking roller connectedtolsrid rod 5 andarranged to be contacted by said first men tioned roller, and saidlocking roller being located between a part of said support and saidfirst mentioned roller so as to bind therebetween when the firstmentioned roller is rotated in one 5 direction.

CHARLES B. ROSE.

REFERENCES CITED The following references are of record in the 10 fileof this patent:

Number Number Great Britain May 24, 1938

